CN111794708A - Double-lock blowout prevention working barrel capable of relieving pressure - Google Patents
Double-lock blowout prevention working barrel capable of relieving pressure Download PDFInfo
- Publication number
- CN111794708A CN111794708A CN202010684079.XA CN202010684079A CN111794708A CN 111794708 A CN111794708 A CN 111794708A CN 202010684079 A CN202010684079 A CN 202010684079A CN 111794708 A CN111794708 A CN 111794708A
- Authority
- CN
- China
- Prior art keywords
- cam
- seat
- ball
- valve
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000002265 prevention Effects 0.000 title abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 71
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 101000794560 Arbacia punctulata Calmodulin-beta Proteins 0.000 claims description 18
- 238000007790 scraping Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims 3
- 239000007788 liquid Substances 0.000 description 17
- 238000003825 pressing Methods 0.000 description 14
- 239000012530 fluid Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 7
- 239000004677 Nylon Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
A double-lock blowout prevention working barrel capable of releasing pressure relates to the technical field of oil field downhole operation and comprises a working barrel assembly and a plug assembly; the invention relates to a working barrel assembly, which comprises a check valve, a coupling, a barrel, a sealing pipe and a lower connector which are sequentially connected through threads from top to bottom, wherein the check valve structurally comprises a valve body and a valve ball, a valve hole is formed in the side wall of the valve body, the axis direction of the valve hole is along the diameter direction of the valve body, the valve ball is arranged in the valve hole, the valve ball always keeps the motion trend of approaching to the axis of a valve seat under the action of the elastic force of a spring so as to block the valve hole, and an upper annular clamping part and a lower annular clamping part are processed on the inner wall of the barrel.
Description
Technical Field
The invention belongs to the technical field of oil field downhole operation, and particularly relates to a pressure-relief double-lock blowout-preventing working barrel.
Background
In the process of underground operation construction of an oil field, when a pipe column is lowered and lifted out, well liquid in the pipe column often overflows to a well mouth due to the fact that the well liquid pressure in the sleeve is large, and well site environment pollution is caused. In order to solve the problem that the well site environment is polluted, a technical personnel designs a wellhead return liquid collecting device, and the environmental pollution is avoided by collecting overflowed well liquid. However, this anti-contamination solution has the disadvantages: 1. the collected well fluid needs to be stored in a liquid storage tank or a liquid storage tank and needs to be transported by a vehicle; 2. well fluids that reach the well are inevitably spilled on the ground in small quantities, so that contamination of the ground by the well fluids is difficult to avoid completely.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a double-lock blowout prevention working barrel capable of relieving pressure.
The technical problem solved by the invention is realized by adopting the following technical scheme: the invention provides a double-lock blowout prevention working barrel capable of relieving pressure, which comprises a working barrel assembly and a blanking plug assembly, wherein the working barrel assembly comprises a cylinder body and a cylinder cover;
the working cylinder assembly comprises a check valve, a coupling, a cylinder body, a sealing tube and a lower connector which are sequentially connected through threads from top to bottom, the check valve structurally comprises a valve body and a valve ball, a valve hole is formed in the side wall of the valve body, the axis direction of the valve hole is along the diameter direction of the valve body, the valve ball is installed in the valve hole, the valve ball always keeps a motion trend close to the axis of a valve seat under the elastic action of a spring, so that the valve hole is blocked, and an upper annular clamping part and a lower annular clamping part are processed on the inner wall of the cylinder body;
the blanking plug assembly comprises a counterweight body, an upper cam seat, a lower cam seat, a sealing section and a guide head which are sequentially connected through threads from top to bottom;
the upper cam seat is internally provided with a limiting block A and a cam A, the cam A is arranged in the upper cam seat through a transverse pin shaft, a torsion spring is arranged on the pin shaft, an extending part is processed on the cam A, the cam A always keeps the motion trend that the extending part extends out of the outer cylindrical surface of the upper cam seat under the action of the elasticity of the torsion spring, and the limiting block A is clamped on the side surface of the cam A, so that the limit position of the cam A after rotation is determined, and when the cam A is located at the limit position, the extending part on the cam A is in an extending state;
the limiting block B and the cam B are installed in the lower cam seat, the cam B is installed in the lower cam seat through a transverse pin shaft, a torsion spring is installed on the pin shaft, an extending portion is machined on the cam B, the cam B always keeps the motion trend that the extending portion extends out of the outer cylindrical surface of the lower cam seat under the action of the elastic force of the torsion spring, the limiting block B is clamped on the side face of the cam B, therefore, the limit position of the cam B after rotation is determined, and when the cam B is located at the limit position, the extending portion on the cam B is in an extending state;
the protruding parts on the cam A and the cam B respectively correspond to the two annular clamping parts on the inner side of the working barrel assembly;
the outer diameter of the sealing section is matched with the inner diameter of a sealing pipe in the working barrel assembly, and a sealing ring is arranged on the outer side of a joint of the sealing section and the guide head.
As a further technical scheme, a plugging device which can be opened through external force is installed in the lower joint.
As a further technical scheme, the plugging device comprises a baffle and shear pins, the upper side of the baffle is limited through a seam allowance on the inner side of the lower connector, and the lower side of the baffle is limited through the shear pins arranged on the side wall of the lower connector.
As a further technical scheme, the plugging device comprises a ball seat, an unlocking ball, a sliding pin, a sliding block, a spring A and a spring B, wherein a radial through hole is formed in the side wall of the ball seat and the side wall of the lower joint, the spring B, the sliding block and the sliding pin are all installed in the radial through hole, the sliding pin is installed on the ball seat in a sliding mode, the sliding block always abuts against the end face of the sliding pin under the elastic action of the spring B, a ball groove matched with the unlocking ball is formed in the ball seat, the sliding pin slides along the axis direction of the sliding pin under the pushing action of the unlocking ball in the ball groove process when the unlocking ball falls into the ball groove, and when the unlocking ball falls into the bottommost part of the ball groove, the joint face between the sliding pin and the sliding block is just located on the cylindrical face outside the.
As a further technical scheme, a spring A is arranged between the lower joint and the ball seat, and the ball seat always keeps a downward movement trend under the elastic force of the spring A.
As a further technical scheme, the plugging device comprises a sealing seat, a piston and a lock pin, wherein the piston is installed in a blind hole in the center of the sealing seat from the upper side, a radial through hole is formed in the side wall of the sealing seat, the lock pin is inserted into the radial through hole, an annular groove matched with the lock pin is formed in the inner wall of the lower joint, one end of the lock pin is inserted into the annular groove, and the other end of the lock pin abuts against the outer side of the piston;
two sealing rings are arranged on a sealing surface between the piston and the sealing seat, a balance channel is processed in an entity of the sealing seat, one end of the balance channel is communicated between the two sealing rings on the outer side of the piston, and the other end of the balance channel is communicated to the lower side of the sealing seat;
an air chamber is provided on the underside of the piston.
As a further technical scheme, a spring C is arranged between the lower joint and the sealing seat, and the sealing seat always keeps a downward movement trend under the action of the elastic force of the spring C.
As a further technical scheme, the lower end of the lower joint is provided with a wax scraping cutting edge.
The invention has the beneficial effects that:
1. the invention is applied to the fishing operation of the oil well pipe column, when the pipe column is lowered and taken out, the blanking plug assembly is put into the well and is clamped with the working barrel assembly which is pre-installed in the well, so that the channel in the center of the pipe column can be plugged, and the problem that the well fluid in the pipe column overflows to the well mouth due to the overlarge well fluid pressure in the sleeve is prevented.
2. According to the invention, two annular clamping parts are arranged in the working barrel assembly, two cams for clamping the annular clamping parts are arranged on the blanking plug assembly, after the blanking plug assembly is put into a pipe column, the two cams on the blanking plug assembly respectively cross the two annular clamping parts in the working barrel assembly, and when the blanking plug assembly is pushed upwards by well fluid pressure, the two cams are respectively clamped on the two annular clamping parts, so that the pushing force of the well fluid on the blanking plug assembly is resisted. Therefore, the invention can realize pressure-bearing plugging and effectively ensure the reliability of plugging.
3. According to the plug-in device, the distance between the two cams on the plug-in device assembly is smaller than the distance between the two annular clamping parts on the working barrel assembly, if one cam is mistakenly clamped or is separated from the other cam during plug-in, the other cam can be firmly clamped, and the purpose of double insurance of plug-in operation is achieved.
4. The setting of the one-way valve prevents the well liquid in the casing from entering the pipe column. When the pipe column is lifted out and lifted, the well liquid in the pipe column and the well liquid in the sleeve pipe generate pressure difference, and then the well liquid in the pipe column can flow back into the sleeve pipe through the check valve, so that no liquid flow overflows at the well mouth. Realizing the environmental protection operation.
5. The lower end of the lower joint is provided with the wax scraping cutting edge, so that oil stains on the inner wall of the casing can be scraped and cleaned when the casing is put into a well, and the casing is prevented from being stuck when a tubular column is put into the well.
6. According to the invention, the lower joint is internally provided with the plugging device which can seal the lower end of the working barrel, so that liquid can not be fed into the pipe column when the well is lowered, and the well mouth can not overflow when the pipe column is lowered into the well.
Drawings
FIG. 1 is a schematic structural view of a work cylinder assembly;
FIG. 2 is a schematic structural view of an obturator assembly;
FIG. 3 is a schematic view of a first embodiment of an occluding device in a lower junction;
FIG. 4 is a schematic view of a second embodiment of an occluding device in a lower junction;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A;
FIG. 6 is a schematic view of a third embodiment of an occluding device in a lower junction;
FIG. 7 is a schematic structural view of another embodiment of an obturator assembly;
fig. 8 is a partial enlarged view at B in fig. 7.
In the figure: 1-valve body, 2-coupling, 3-cylinder, 4-sealing tube, 5-lower joint, 6-wax scraping edge, 7-counterweight body, 8-limiting block A, 9-cam A, 10-limiting block B, 11-cam B11, 12-sealing section, 13-guiding head, 14-sealing ring, 15-lower cam seat, 16-extension part, 17-upper cam seat, 18-baffle, 19-shear pin, 20-ball seat, 21-spring A, 22-unlocking ball, 23-sliding block, 24-sliding pin, 25-spring B, 26-piston, 27-sealing seat, 28-locking pin, 29-spring C, 30-valve ball, 31-valve hole, 32-annular clamping part and 33-balance channel, 34-an air cavity, 35-a driving rod, 36-a pressing sleeve, 37-a spring D, 38-a piston rod, 39-a tip, 40-a rubber sleeve, 41-a sliding rod, 42-a check valve, 43-a nylon pin and 44-a withdrawal groove.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the present invention includes a mandrel assembly and an obturator assembly;
as shown in figure 1, the working barrel assembly comprises a check valve, a coupling 2, a barrel 3, a sealing pipe 4 and a lower joint 5 which are connected in sequence from top to bottom through threads, and the check valve is arranged to prevent well fluid in a sleeve from entering a pipe column. When the pipe column is lifted out and lifted, the well liquid in the pipe column and the well liquid in the sleeve pipe generate pressure difference, and then the well liquid in the pipe column can flow back into the sleeve pipe through the check valve, so that no liquid flow overflows at the well mouth. Realizing the environmental protection operation. The structure of the check valve comprises a valve body 1 and a valve ball 30, wherein a valve hole 31 is formed in the side wall of the valve body 1, the axis direction of the valve hole 31 is along the diameter direction of the valve body 1, the valve ball 30 is installed in the valve hole 31, the valve ball 30 always keeps the motion trend close to the axis of the valve seat 1 under the elastic action of a spring, so that the valve hole 31 is blocked, and an upper annular clamping part and a lower annular clamping part 32 are processed on the inner wall of the cylinder 3;
as shown in fig. 2, the blanking plug assembly comprises a counterweight body 7, an upper cam seat 17, a lower cam seat 15, a sealing section 12 and a guide head 13 which are connected in sequence from top to bottom through threads;
a limiting block A8 and a cam A9 are installed in the upper cam seat 17, the cam A9 is installed in the upper cam seat 17 through a transverse pin shaft, a torsion spring is installed on the pin shaft, a protruding portion 16 is machined on the cam A9, the cam A9 always keeps the movement trend that the protruding portion 16 protrudes from the outer cylindrical surface of the upper cam seat 17 under the elastic action of the torsion spring, the limiting block A8 is clamped on the side surface of the cam A9, so that the limit position of the cam A9 after rotation is determined, and when the cam A9 is located at the limit position, the protruding portion 16 on the cam A9 is in the protruding state;
a limit block B10 and a cam B11 are installed in the lower cam seat 15, the cam B11 is installed in the lower cam seat 15 through a transverse pin shaft, a torsion spring is installed on the pin shaft, an extending part 16 is also processed on the cam B11, the cam B11 always keeps the movement trend of enabling the extending part 16 to extend out of the outer cylindrical surface of the lower cam seat 15 under the action of the elastic force of the torsion spring, the limit block B10 is clamped on the side surface of the cam B11, so that the limit position of the cam B11 after rotation is determined, and when the cam B11 is at the limit position, the extending part 16 on the cam B11 is in the extending state;
the protruding parts 16 on the cam A9 and the cam B11 correspond to two annular clamping parts 32 on the inner side of the working barrel assembly respectively.
According to the invention, two annular clamping parts 32 are arranged in the working barrel assembly, two cams for clamping the annular clamping parts 32 are arranged on the blanking plug assembly, after the blanking plug assembly is put into a tubular column, the two cams on the blanking plug assembly respectively cross the two annular clamping parts 32 in the working barrel assembly, and when the blanking plug assembly is pushed upwards by well fluid pressure, the two cams are respectively clamped on the two annular clamping parts 32, so that the pushing force of the well fluid on the blanking plug assembly is resisted. Therefore, the invention can realize pressure-bearing plugging and effectively ensure the reliability of plugging.
The outer diameter of the sealing section 12 is matched with the inner diameter of the sealing tube 4 in the working barrel assembly, and a sealing ring 14 is arranged on the outer side of the joint part of the sealing section 12 and the guide head 13.
The invention is applied to the fishing operation of the oil well pipe column, when the pipe column is lowered and taken out, the blanking plug assembly is put into the well and is clamped with the working barrel assembly which is pre-installed in the well, so that the channel in the center of the pipe column can be plugged, and the problem that the well fluid in the pipe column overflows to the well mouth due to the overlarge well fluid pressure in the sleeve is prevented.
The working process of the invention is as follows:
during operation, the working barrel assembly is connected to the lower end of the oil pipe column and is arranged in the well, when the pipe column is lifted, the blanking plug assembly is thrown into the pipe column before the pipe column is lifted, the blanking plug assembly falls under the action of self gravity and is finally inserted into the working barrel assembly and clamped with the working barrel assembly, so that the pipe column is plugged, and the blowout prevention purpose is achieved.
When the plug is put into operation, the distance between the two cams on the plug assembly needs to be smaller than the distance between the two annular clamping parts 32 on the working barrel assembly, if one cam is mistakenly clamped or is separated from the clamping part during plug throwing, the other cam can be firmly clamped, and the purpose of double insurance of plug throwing operation is achieved.
As a further technical solution, a plugging device which can be opened by external force may be installed in the lower joint 5. The lower end of the working barrel assembly can be sealed by the plugging device, so that liquid can not be fed into the pipe column when the pipe column is lowered into the well, and the well mouth can not overflow when the pipe column is lowered into the well. Before oil pumping operation, a certain technological means is needed to open the plugging device (i.e. to remove plugging), so that the blockage of the plugging device on the oil pumping operation is avoided.
The following embodiments may be used for the occlusion device:
the first embodiment is as follows:
as shown in fig. 3, the blocking device comprises a baffle plate 18 and shear pins 19, wherein the upper side of the baffle plate 18 is limited by a spigot at the inner side of the lower joint 5, and the lower side of the baffle plate 18 is limited by the shear pins 19 arranged on the side wall of the lower joint 5. Before oil pumping operation, a metal rod is taken as a throwing rod, the throwing rod is thrown into a pipe column for dredging, the throwing rod impacts a baffle 18, a shear pin 19 is sheared, the baffle 18 and the throwing rod fall to the bottom of a man-made well, and the dredging and plugging work is finished. The material of the throwing rod can be made of lead or tungsten with higher density.
The advantage of this embodiment is simple structure, convenient operation, and the shortcoming can not bear too high pressure in the tubular column (too high pressure shear pin 19 can be sheared), has restricted the application of the downhole tool who adopts pressure to open that establishes ties on the tubular column. In addition, the shear pin 19 may not be sheared due to factors such as the inclination of the well, the weight of the rod, and the machining accuracy of the shear pin 19.
Example two:
as a further technical solution, as shown in fig. 4 and 5, the blocking device comprises a ball seat 20, an unlocking ball 22, a sliding pin 24, a sliding block 23, a spring a21 and a spring B25, the side walls of the ball seat 20 and the lower joint 5 are provided with radial through holes, the spring B25, the sliding block 23 and the sliding pin 24 are all arranged in the radial through holes, wherein, the sliding pin 24 is installed on the ball seat 20 in a sliding way, the sliding block 23 is always abutted against the end surface of the sliding pin 24 under the elastic force of the spring B25, a ball groove matched with the unlocking ball 22 is arranged in the ball seat 20, when the unlocking ball 22 falls into the ball groove, the sliding pin 24 slides in the direction of its own axis under the urging action of the unlocking ball 22, when the unlocking ball 22 is seated at the lowermost portion of the ball groove, the abutting surface between the slide pin 24 and the slide block 23 is located just on the cylindrical surface outside the ball seat 20.
In this embodiment, a ball-throwing opening method is adopted instead of the stick-throwing opening method in the first embodiment, before the unlocking ball 22 is thrown, the sliding block 23 is caught between the lower joint 5 and the ball seat 20, so that the ball seat 20 is stably connected to the lower joint 5, and after the unlocking ball is thrown, the sliding block 23 and the sliding pin 24 slide to the position shown in fig. 5, in which the locking action of the sliding block 23 on the ball seat 20 is released, and the ball seat 20 falls to the bottom hole of the artificial well together with the unlocking ball 22.
The advantage of this embodiment is that operational reliability is high, and is better to highly deviated well's adaptability, also can guarantee that the tubular column can bear higher pressure.
As a further technical solution, a spring a21 is provided between the lower joint 5 and the ball seat 20, and the ball seat 20 always keeps a downward movement trend under the elastic force of the spring a 21. The provision of spring a21 allows ball seat 20 to be more easily disengaged from lower connector 5.
Example three:
as shown in fig. 6, as a further technical solution, the blocking device includes a sealing seat 27, a piston 26 and a lock pin 28, the piston 26 is installed in a blind hole in the center of the sealing seat 27 from the upper side, a radial through hole is processed on the side wall of the sealing seat 27, the lock pin 28 is inserted into the radial through hole, an annular groove matching with the lock pin 28 is processed on the inner wall of the lower joint 5, one end of the lock pin 28 is inserted into the annular groove, and the other end of the lock pin 28 abuts against the outer side of the piston 26;
two sealing rings 14 are arranged on a sealing surface between the piston 26 and the sealing seat 27, a balance channel 33 is machined in an entity of the sealing seat 27, one end of the balance channel 33 is led to a position between the two sealing rings 14 on the outer side of the piston 26, and the other end of the balance channel 33 is led to the lower side of the sealing seat 27;
the underside of the piston 26 is provided with an air chamber 34.
The advantage of this embodiment is, need not to throw stick or throw the ball, and only need normally start the beam-pumping unit alright remove the shutoff of plugging device. Specifically, after the pumping unit is started, the piston 26 moves upwards under the pumping action of the oil well pump, and the air chamber 34 is arranged to ensure that the piston 26 can move upwards to a small extent so as not to be completely sucked by vacuum. When the lower seal ring 14 on the outside of the piston 26 passes over the port of the balance passage 33, the balance passage 33 communicates with the air chamber 34, so that the vacuum in the air chamber 34 is completely released, and the piston 26 continues to move upward until the limit action of the outside of the piston 26 on the lock pin 28 is released. At this time, the lock pin 28 is laterally moved, so that the connection between the seal holder 27 and the lower joint 5 is released.
As a further technical solution, a spring C29 is arranged between the lower joint 5 and the sealing seat 27, and the sealing seat 27 always keeps a downward movement trend under the elastic force of the spring C29. The provision of the spring C29 makes it easier to disengage the seal holder 27 from the lower joint 5.
As a further technical scheme, the lower end of the lower joint 5 is provided with a wax scraping cutting edge 6, oil stains on the inner wall of the casing can be scraped and cleaned when the casing is lowered into a well, and the casing is guaranteed not to be stuck when a tubular column is lowered.
In order to improve the sealing performance between the working barrel assembly and the blanking plug assembly, in the blanking plug assembly, the cam B11 and the part below the lower cam seat 15 can also adopt an alternative structure which comprises a pressing sleeve 36, a piston rod 38, a head 39, a driving rod 35 and a rubber sleeve 40, wherein the pressing sleeve 36 is connected at the lower end of the lower cam seat 15 through threads, the upper part of the piston rod 38 is provided with two sealing sections which are called an upper sealing section and a lower sealing section, the upper sealing section is inserted into a through hole at the bottom of the lower cam seat 15 and is in sliding sealing with the inner wall of the through hole, the outer wall of the lower sealing section is in sliding matching and sealing with the inner wall of the pressing sleeve 36, the head 39 is connected at the lower end of the piston rod 38 through threads, the rubber sleeve 40 is sleeved outside the lower part of the piston rod, the upper end of the rubber sleeve 40 is limited by the lower end face of the pressing sleeve 36, a blind hole is processed in the center of the top of the piston rod 38, the driving rod 35 is inserted into the blind hole, a radial through hole is processed on the side surface of the piston rod 38, a sliding rod 44 is arranged in the radial through hole, a groove corresponding to the sliding rod is processed on the inner wall of the pressing sleeve 36, one end of the sliding rod 44 is inserted into the groove, the other end of the sliding rod 44 is abutted against the outer wall of the driving rod 35, thereby locking the piston rod 38 to the pressing sleeve 36 (as shown in fig. 8), the outside of the driving rod 35 is provided with a retreat groove 45 for the slide rod 44 to enter, when one end of the sliding rod 44 enters the retreat groove 45, the other end of the sliding rod 44 is separated from the groove at the inner side of the pressing sleeve 36, thereby releasing the locked state between the pressing sleeve 36 and the piston rod 38, the upper end of the drive lever 35 abuts against the cam B11, a spring D37 is arranged between the pressing sleeve 36 and the piston rod 38, and the piston rod 38 always keeps an upward movement trend under the elastic force of the spring D37.
When the plug assembly is put into the cylinder assembly, the protrusion 16 of the cam B11 is touched to rotate the cam B11 in the counterclockwise direction in the state shown in fig. 7, the drive lever 35 is moved downward by the cam B11 to align the end of the slide lever 44 with the retreat groove 45 of the drive lever 35, the locked state between the pressing sleeve 36 and the piston rod 38 is released, and after the locked state is released, the piston rod 38 is moved upward by the spring D37 to compress the rubber sleeve 40, thereby increasing the diameter of the rubber sleeve 40. Compared with the sealing by the sealing ring 14, the compression sealing mode can not only improve the sealing effect between the working barrel assembly and the plug assembly, but also prevent the sealing element from being damaged in the process of descending the well by the plug assembly.
As a further technical solution, the annular space between the upper sealing section of the piston rod 38 and the pressing sleeve 36 may be evacuated, and the extrusion force borne by the rubber sleeve 40 may be greatly increased by evacuation, thereby further greatly improving the sealing performance.
In addition, in order to realize the vacuum pumping process, a check valve can be additionally arranged on the side wall of the pressing sleeve 36, so that air inside the pressing sleeve 36 can only be discharged but can not enter. In order to maintain the drive lever 35 in a stable position before the rotation of the cam B11, the drive lever 35 may be provided with a nylon pin 43, and the nylon pin 43 may be easily sheared after the rotation of the cam B11, so that the downward movement of the drive lever 35 is not hindered.
Claims (8)
1. The utility model provides a working barrel is prevented spouting by double lock that can let out pressure which characterized in that: comprises a working barrel assembly and a blanking plug assembly;
the working cylinder assembly comprises a check valve, a coupling (2), a cylinder body (3), a sealing pipe (4) and a lower connector (5) which are sequentially connected through threads from top to bottom, the structure of the check valve comprises a valve body (1) and a valve ball (30), a valve hole (31) is formed in the side wall of the valve body (1), the axis direction of the valve hole (31) is along the diameter direction of the valve body (1), the valve ball (30) is installed in the valve hole (31), the valve ball (30) always keeps a motion trend close to the axis of a valve seat (1) under the elastic force action of a spring, so that the valve hole (31) is sealed, and an upper annular clamping part and a lower annular clamping part (32) are processed on the inner wall of the cylinder body (3);
the blanking plug assembly comprises a counterweight body (7), an upper cam seat (17), a lower cam seat (15), a sealing section (12) and a guide head (13) which are sequentially connected through threads from top to bottom;
a limiting block A (8) and a cam A (9) are installed in the upper cam seat (17), the cam A (9) is installed in the upper cam seat (17) through a transverse pin shaft, a torsion spring is installed on the pin shaft, a protruding portion (16) is machined on the cam A (9), the cam A (9) always keeps a movement trend that the protruding portion (16) protrudes from the outer cylindrical surface of the upper cam seat (17) under the action of the elastic force of the torsion spring, the limiting block A (8) is clamped on the side surface of the cam A (9), so that the limit position of the cam A (9) after rotation is determined, and when the cam A (9) is located at the limit position, the protruding portion (16) on the cam A (9) is located in a protruding state;
a limiting block B (10) and a cam B (11) are installed in the lower cam seat (15), the cam B (11) is installed in the lower cam seat (15) through a transverse pin shaft, a torsion spring is installed on the pin shaft, an extending part (16) is also processed on the cam B (11), the cam B (11) always keeps a movement trend that the extending part (16) extends out of the outer cylindrical surface of the lower cam seat (15) under the action of the elastic force of the torsion spring, the limiting block B (10) is clamped on the side surface of the cam B (11), so that the limit position of the cam B (11) after rotation is determined, and when the cam B (11) is located at the limit position, the extending part (16) on the cam B (11) is located in an extending state;
the protruding parts (16) on the cam A (9) and the cam B (11) respectively correspond to two annular clamping parts (32) on the inner side of the working barrel assembly;
the outer diameter of the sealing section (12) is matched with the inner diameter of a sealing pipe (4) in the working barrel assembly, and a sealing ring (14) is installed on the outer side of the joint of the sealing section (12) and the guide head (13).
2. The double-lock blowout preventer working cylinder capable of being depressurized according to claim 1, wherein: and a plugging device which can be opened by external force is arranged in the lower joint (5).
3. A depressible dual lock blowout preventer mandrel according to claim 2, wherein: the plugging device comprises a baffle (18) and shear pins (19), the upper side of the baffle (18) is limited through a seam allowance at the inner side of the lower joint (5), and the lower side of the baffle (18) is limited through the shear pins (19) arranged on the side wall of the lower joint (5).
4. A depressible dual lock blowout preventer mandrel according to claim 2, wherein: the plugging device comprises a ball seat (20), an unlocking ball (22), a sliding pin (24), a sliding block (23), a spring A (21) and a spring B (25), wherein radial through holes are formed in the side walls of the ball seat (20) and the lower joint (5), the spring B (25), the sliding block (23) and the sliding pin (24) are all installed in the radial through holes, the sliding pin (24) is installed on the ball seat (20) in a sliding mode, the sliding block (23) always abuts against the end face of the sliding pin (24) under the elastic force action of the spring B (25), a ball groove matched with the unlocking ball (22) is formed in the ball seat (20), when the unlocking ball (22) falls into the ball groove, the sliding pin (24) slides in the axis direction of the sliding pin under the pushing action of the unlocking ball (22), and when the sliding block (22) falls into the bottom of the ball groove, the joint face between the sliding pin (24) and the sliding pin (23) is just located on the cylindrical surface on the outer side of the ball seat (20) .
5. The double-lock blowout preventer working cylinder capable of being depressurized according to claim 4, wherein: a spring A (21) is arranged between the lower joint (5) and the ball seat (20), and the ball seat (20) always keeps a downward movement trend under the elastic force action of the spring A (21).
6. A depressible dual lock blowout preventer mandrel according to claim 2, wherein: the plugging device comprises a sealing seat (27), a piston (26) and a lock pin (28), wherein the piston (26) is installed in a blind hole in the center of the sealing seat (27) from the upper side, a radial through hole is formed in the side wall of the sealing seat (27), the lock pin (28) is inserted into the radial through hole, an annular groove matched with the lock pin (28) is formed in the inner wall of the lower connector (5), one end of the lock pin (28) is inserted into the annular groove, and the other end of the lock pin (28) abuts against the outer side of the piston (26);
two sealing rings (14) are arranged on a sealing surface between the piston (26) and the sealing seat (27), a balance channel (33) is machined in an entity of the sealing seat (27), one end of the balance channel (33) leads to a position between the two sealing rings (14) on the outer side of the piston (26), and the other end of the balance channel (33) leads to the lower side of the sealing seat (27);
an air chamber (34) is provided on the underside of the piston (26).
7. The double-lock blowout preventer working cylinder according to claim 6, wherein: a spring C (29) is arranged between the lower joint (5) and the sealing seat (27), and the sealing seat (27) always keeps a downward movement trend under the elastic force action of the spring C (29).
8. A depressible, double lock blowout preventer mandrel according to claims 1-7, wherein: the lower end of the lower joint (5) is provided with a wax scraping cutting edge (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010684079.XA CN111794708B (en) | 2020-07-16 | 2020-07-16 | Double-lock blowout prevention working barrel capable of relieving pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010684079.XA CN111794708B (en) | 2020-07-16 | 2020-07-16 | Double-lock blowout prevention working barrel capable of relieving pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111794708A true CN111794708A (en) | 2020-10-20 |
| CN111794708B CN111794708B (en) | 2021-03-23 |
Family
ID=72807336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010684079.XA Active CN111794708B (en) | 2020-07-16 | 2020-07-16 | Double-lock blowout prevention working barrel capable of relieving pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111794708B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110905446A (en) * | 2018-09-18 | 2020-03-24 | 中国石油天然气股份有限公司 | Double-ball switch device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201826805U (en) * | 2010-10-18 | 2011-05-11 | 中国石油化工股份有限公司 | Tubing plug for oil and gas field |
| CN204327032U (en) * | 2014-11-10 | 2015-05-13 | 中国石油化工股份有限公司 | A kind of blanking plug and use the blowout prevention assembly of this blanking plug |
| CN105275439A (en) * | 2015-10-26 | 2016-01-27 | 中国石油天然气股份有限公司 | Water injection well operation hanging type water distributor blowout prevention blockage device |
| CN106761551A (en) * | 2017-02-03 | 2017-05-31 | 东北石油大学 | The anti-pollution controller of oil pipe overflow |
| WO2017200788A1 (en) * | 2016-05-19 | 2017-11-23 | Spring Oil Tools Llc | Controlled opening valve |
| CN111411914A (en) * | 2019-01-07 | 2020-07-14 | 中国石油化工股份有限公司 | Blowout prevention blanking plug for shaft |
-
2020
- 2020-07-16 CN CN202010684079.XA patent/CN111794708B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201826805U (en) * | 2010-10-18 | 2011-05-11 | 中国石油化工股份有限公司 | Tubing plug for oil and gas field |
| CN204327032U (en) * | 2014-11-10 | 2015-05-13 | 中国石油化工股份有限公司 | A kind of blanking plug and use the blowout prevention assembly of this blanking plug |
| CN105275439A (en) * | 2015-10-26 | 2016-01-27 | 中国石油天然气股份有限公司 | Water injection well operation hanging type water distributor blowout prevention blockage device |
| WO2017200788A1 (en) * | 2016-05-19 | 2017-11-23 | Spring Oil Tools Llc | Controlled opening valve |
| CN106761551A (en) * | 2017-02-03 | 2017-05-31 | 东北石油大学 | The anti-pollution controller of oil pipe overflow |
| CN111411914A (en) * | 2019-01-07 | 2020-07-14 | 中国石油化工股份有限公司 | Blowout prevention blanking plug for shaft |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110905446A (en) * | 2018-09-18 | 2020-03-24 | 中国石油天然气股份有限公司 | Double-ball switch device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111794708B (en) | 2021-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2003207329B2 (en) | Ball dropping assembly | |
| US6715541B2 (en) | Ball dropping assembly | |
| US10597974B2 (en) | Downhole valve apparatus | |
| CN111794708B (en) | Double-lock blowout prevention working barrel capable of relieving pressure | |
| CA2627822C (en) | Top hold down rod pump with hydraulically activated drain and method of use | |
| US10968722B2 (en) | Valve assembly and method of controlling fluid flow in an oil, gas or water well | |
| CN111535784B (en) | Negative pressure suction and gas lift combined action pump and operation method thereof | |
| CN212201962U (en) | Ball throwing type hydraulic multi-switch bypass valve | |
| CN216950317U (en) | Piston type multi-activation bypass valve | |
| CN113863888B (en) | Underground three-channel integrated blowout preventer for double-tube drilling | |
| CN113914820A (en) | But switch hydraulic pressure sliding sleeve | |
| US20100051290A1 (en) | Pressure Actuated Piston Type Casing Fill-up Valve and Methods of Use Thereof | |
| CA3004149A1 (en) | Downhole tool having an axial passage and a lateral fluid passage being opened / closed | |
| CN217813369U (en) | Negative pressure bailing barrel | |
| US20240133266A1 (en) | Downhole sealing apparatus | |
| CN216198877U (en) | Underground moving cylinder type single-action pump for rodless drainage and production system | |
| CN216866657U (en) | Sand flushing and preventing integrated pipe column | |
| CN220621818U (en) | Tail pipe composite rubber plug | |
| CN216142737U (en) | Sectional filling tool for sidetracking horizontal well | |
| CN111441739B (en) | Mechanical compression type tubular column switch type packer | |
| CN220015125U (en) | Differential pressure control type one-way valve and tool pipe string | |
| EP3803031B1 (en) | Downhole completion system | |
| CN115680575A (en) | Sectional filling tool for sidetracking horizontal well | |
| CN211524789U (en) | Two-stage three-section water injection string operating under pressure | |
| CN112443285B (en) | Sand control device capable of replacing slurry outside pipe and slurry replacing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |